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Feature description
The Small Window (aka picture-in-picture mode) feature allows you to display a window overlaying other apps and pin it to the edge of the screen as an always-on small label. The label can be freely moved along the side edges of the screen.
Why do you want this feature?
This mode in the case of a image gallery is convenient because it allows you to place a sticker on the screen with data that you need constant access to while working with another application. At the same time, unlike Split-screen, this mode does not significantly reduce the size of the main application, but prevents it from being unloaded from memory without having to disable memory optimization for this application.
Checklist
Feature description
The Small Window (aka picture-in-picture mode) feature allows you to display a window overlaying other apps and pin it to the edge of the screen as an always-on small label. The label can be freely moved along the side edges of the screen.
Why do you want this feature?
This mode in the case of a image gallery is convenient because it allows you to place a sticker on the screen with data that you need constant access to while working with another application. At the same time, unlike Split-screen, this mode does not significantly reduce the size of the main application, but prevents it from being unloaded from memory without having to disable memory optimization for this application.
Additional information
Android Developers / Develop / Core areas / UI / Guides / Support multi-window mode